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	<title>Document</title>
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		#a{
			font-size: 70px;
			color: green;
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		.lei{
			font-size: 30px;
			color: red;
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		span{
			font-size: 60px;
			color: blue;
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	    p,span{
	    	color: red;
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		span h4{
			font-size: 100px;
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		*{
			font-family: "微软雅黑";
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		h4:hover{
			font-family: "宋体";
			background-color:blue;
			
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	<p id="a">我是id选择器</p>
	<p class="lei">我是类选择器</p>
	<p class="lei">我是类选择器</p>
	<p class="lei">我是类选择器</p>
	<p class="lei">我是类选择器</p>
	<p class="lei">我是类选择器</p>
	<p class="lei">我是类选择器</p>
	<span>我是标签<h4>选择器</h4></span>
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